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UNWRAP -TDM
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Using the additive approach, UnWrap preserves the Left and Right channels bit
transparent all the way down to the LSB of a 24 bit input. If the original stereo-mix is
later requested, it can be obtained using only these two channels.
If subsequent down-mix capability using all the channels is essential, this option is
available too. In both cases, the LFE channel can be fully exploited, omitted or
anything in between, as can the Center.
Program related conversion options
It has been TC's goal to provide presets that can make any kind of program material
present itself better and more engaging in 5.1 than in stereo. From old to recent pop
and rock music, from unique classical recordings to highly ambient modern tracks,
from ultra dry to wet source material, UnWrap comes with settings to complement it
all.
Add to the default presets the capability to time-align all channels at sample
precision, widen or narrow the image, control the amount of Center and LFE channel
to be used, change filters and envelopes, and you begin to get an idea of the power
behind this new algorithm.
Introduction
UnWrap in use
UnWrap measures phase, delay and spectral differences between a pair of stereo
channels to create a 5.1 result. For different program material there will be different
optimum settings that best represent the qualities put into the original mix.
Please familiarize yourself with the controls and parameter-ranges on known material
before you attempt unwrapping new stuff.
Setting up
Try loading some of the UnWrap presets. You can A/B the process by pressing Bypass.
You may also experiment for stereo compatibility using the downmix levels on the D-
MIX page.
Time alignment
When all Delays are set at "0", all Outputs from UnWrap are aligned with sample
precision. The basic Delay through the algorithm in this case is 3.6 ms at 44.1 and
48kHz. Try offsetting the Delays in samples and ms, and note the shift in image.
Delays may be used...
- on the Surround channels to ensure that sounds appear to originate from the front
speakers
- on the Center channel to compensate for its position
- on the LFE channel to compensate for speaker position or to advance/delay it for
artistic reasons.
When the front channels are not assigned the same Delay, please note that a
subsequent stereo down-mix may not work so well. Use the downmix function
accessible via the Downmix page to compare processed and unprocessed material.